CSC3320 Lab 4 Solved

Purpose: Practices on the grep family commands to process texts in files.

Note: Please follow the instructions below, and write a report by answering the questions and upload the report (named as Lab4_P1_FirstNameLastName.pdf or Lab4_P1_FirstNameLastName.doc) to Google Classroom.

Please add the lab assignment NUMBER and your NAME at the top of your file sheet.

Open your terminal and connect to snowball server. Change your directory to your home directory (cd ~ ), and then create a new directory named as “Lab4” (mkdir Lab4). After that, go to directory Lab4 (cd Lab4) and please download the file “CSC_Course.txt” by the following command (internet access required):

cp /home/frondel/Public/CSC_Course.txt CSC_Course.txt

Be sure it succeeds using “ls” to see the file name “CSC_Course.txt” listed.

Note: marks a single space.

1. 1)  $more CSC_Course.txt

   Check the content of “CSC_Course.txt” using more.
   Note: When viewing the file, you may need to use command f (forward one screen), b (backward one screen) and q(quit).

2. 2)  $grep ‘CSC 3320’ CSC_Course.txt
   Note: there is a single space between “CSC” and “3320”

   Output the lines containing the string “CSC 3320″(search the course the number of which is “CSC 3320”)

3. 3)  $grep -i ‘CSC 3320’ CSC_Course.txt

   Output the lines containing the string “CSC 3320” via ignoring case (search the information related to CSC3320)

4. 4)  $ grep ‘CSC 3’ CSC_Course.txt

   Attach a screenshot of the output and describe what this command does.

Try the following commands step by step and finish the required tasks from step 4)

to step 16).

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5. 5)  $ grep ‘CSC 3|CSC 1’ CSC_Course.txt

   Attach a screenshot of the output and describe what this command does.

6. 6)  $ grep -E ‘CSC 3|CSC 1’ CSC_Course.txt
   Attach a screenshot of the output and describe what this command does.

     Use extend regular expression
   

7. 7)  $ egrep ‘CSC 3|CSC 1’ CSC_Course.txt

   Attach a screenshot of the output and describe what this command does.

8. 8)  $ fgrep ‘3.000 Credit hours’ CSC_Course.txt

   Attach a screenshot of the output and describe what this command does.

9. 9)  $ fgrep -x ‘3.000 Credit hours’ CSC_Course.txt Attach a screenshot of the output and describe what this command does.

10) $ grep ‘CSC.*Programming’ CSC_Course.txt

Attach a screenshot of the output and describe what this command does.

11) $ grep ‘^CSC.*Programming$’ CSC_Course.txt Attach a screenshot of the output and describe what this command does.

12) $ grep –color ‘CSC[^3]*3{2}’ CSC_Course.txt

Only match the whole line

Attach a screenshot of the output and describe what this command does.

No result, {} is not a special character

13) $ egrep –color -w ‘CSC[^3]*3{2}[^3]*’ CSC_Course.txt

Attach a screenshot of the output and describe what this command does.

-w Select only those lines containing matches that form whole words.

14) $ grep ‘CSC.*C++’ CSC_Course.txt

Attach a screenshot of the output and describe what this command does.

+ is not a special character in basic regular expression

15) $ egrep ‘CSC.*C\+\+’ CSC_Course.txt

Attach a screenshot of the output and describe what this command does.

Convert +

16) $ egrep ‘CSC.*C++’ CSC_Course.txt

Please only describe what this command does.

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Optional Part:

1) $ sed -E -n ‘s/(CSC 3[0-9]{3})(.*)/\1/p’ CSC_Course.txt

Attach a screenshot of the output and describe what this command does.

2)$ awk -F’-‘ ‘/(CSC 3[0-9]{3})(.*)/{print $1}’ CSC_Course.txt

Attach a screenshot of the output and describe what this command does.

3) $ sed -E -n ‘s/(CSC [0-9]{4})( – )(.*)/\3/p’ CSC_Course.txt

Attach a screenshot of the output and describe what this command does.

4) $ sed -E -n ‘s/(CSC [0-9]{4})( – )(.*)/\3/p’ CSC_Course.txt| sort

Attach a screenshot of the output and describe what this command does.

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